More support for version 4 of DWARF.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@178717 91177308-0d34-0410-b5e6-96231b3b80d8
Revert code I didn't mean to check in.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@178718 91177308-0d34-0410-b5e6-96231b3b80d8
<rdar://problem/12897145>

Changes to lldb made the following fail when it used to work:

% cd /tmp
% lldb ls
error: unable to find executable for '/tmp/ls'

Resolving an executable with no relative path was broken, now its fixed.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@178719 91177308-0d34-0410-b5e6-96231b3b80d8